A functional model of the earliest form of steam turbine described by Hero of Alexandria. Comprising a borosilicate glass bulb 70mm diameter approx., with side arms bent at right angles and formed into jets at their tips. The bulb is mounted horizontally on a stand, which leaves it free to rotate about its axis. Boiling the water contained in bulb ejects steam from the nozzles with high velocity triggering its rotation. Supplied complete with stand but without burner. Hero’s Engine mounted on metal stand Hero’s Engine mounted on wooden stand Glass part, spare